I'm a user-friendlier drop-in replacement for the standard <select> with multiple attribute activated. Free (under WTFPL license) Works in an unobtrusive fashion Fully open sourced Keyboard support Provides some callbacks Fully customizable via CSS Depends on jQuery 1.8+ Tiny code ~8kb minified HTML <html> <head> <link href="path/to/multiselect.css" media="screen" rel="stylesheet" type="text/css">